Rotary pump



H. JUNKERS ROTARY PUMP Filed June 29. 1920 atented Mll'- 4,'

Application iled June 29, 1920. Serial No. 393, .w1 V.

To ,all 'whom t may concern.'

Be it known lthat I, HUGO citizen of the German Empire,

Dessau, Germany JUNKnns, a residing at have invented certain mprovements in Rotary cation.

My invention refers to rotary pumps and more especially to the so-called rotary pis- Be ton pumps, in which in a ring chamber Several rotary pistons revolve at uniform speed and thereby force the'medium to be pumped from a suction chamber in-to a pressure chamber, while a rotary valve cooperetes with the rotary pistons.

My invention aims at providing a rotary piston pump of little weight and simple design which 1s nevertheless adapted to safely withstand the stresses caused by the piston 520 revolving at high'speed (up to 2000 revolutions per minute), such pump bein .particularly useful for the purpose of fee ing scavengin air into light weight high speed interna combustion engines.

In the drawings afiixed to this-s ecica-v tion and forming part thereof ieren-t modications of a pump embodying my invention are illustrated by way of example. In the drawin Figs. 1 and 2 are a longitudinal section on line III-III in Fig. 2, and a cross-section, respectively, of a pump comprising a. single piston body cooperating with a rotary valve.

Figs. 3 and 4 are cross-sections of two further modifications with a pluralityv of piston bodies cooperating with a simple rotaiiy valve. 1

igs. 5 and 6 are a cross-section and a developed section respectively, of a fourth modification, the section in Fig 6 being taken on the line VIII-VIII in i 5, an

Fi 7 and 8 are like views o a fifth mod' cation.

Fig. 9 is a side elevation.`

Referr' to Figs. 1 and 2 of the drawings, 1 is t e pump casing and 2 is a cover disposed at one end' thereof, while 3 is an annular discs surrounding the journals 14 and 15, respectively, ball bearings 12, 13 being inserted between said discs and said journals so that the discs ed on said journals in revolving around them. 17 is a toothed rimdisposed on one of said discs and rejecting from said cas-l ing so as to serve or driving said discs and the pistons 5, 5 extending between them and formed integral therewith, the discs and pistons then forming a rigid, vvell'balanced rotary body evenly supported on bearings at both its ends. 4In consequence thereof the resistance of the rotary pistons against the action of the centrifugal forces is considerably increased as compared with the arran ements hitherto in use, and a noiseless woriing free from vibrations is ensured even at high speed. j y

21 is the rotary valve `cooperating with the pistons in a well hewn manner.

In order to be able to increase the height h of the rota istons in com arison to the radius R d? the space covere b them and thus to make them resist better t e centrifugal forces, the valve is designed so that the-'number of its gaps is greater than the number of the rotary is bound to revolve s ower than the rota piston bod in inverse proportion of these numbers. ith such a valve a considerably greater freedom is attained as to the arrangement of the gaps and it is poible to put to use u to 80% of the entire cylinder space of ra ius R covered pistons for pumping air.

In Fig. 2 a pump litted with such a valve is shown. Va ve 21 has five gaps 20 engaging 'with three rota istons 5. The number of revolutions o t e rotary piston body is to that of the valve as 5:3.

The enlargement of the .space necessarily required Jfor thev pumpy caused by this enlar ement of the valve can be balanced by ma in such a valve containing a comparatively arge number ofgaps several rotary piston bodies.v S ples are shown 1n Figs. 3 and 4. y

According to Fig. 3 one valve containing five gaps engages with two rotary piston rotary pistons each.

ome 'exambodies containing are irmly supportf to engage with.

by the rotary y According to vFig. 4 four Ipiston bodies containing two rotary pistons each are arranged arcund a valve also containing fiveA gap.

both cases the separate rotary pistons engage with the valve so that the pumpingI cycles overlap each other; whereby a very even flow of air is obtained.

As the arrangement of several rotary pistonv bodies around a single rotary valve involves a very complicated design of the admission and exhaust channels and, in con-v the two piston cases 28 are enclosed in the pump case formed by a jacketv 31, the helical walls 26 of which divide it into wide v chambers 25, 30. At one or the other end of the pump, the air or other medium enters the chambers 25 in axial direction, as

indicated by arrows in Fig. 6 and is guidedl therein by the helical walls 26 which oder but little resistance to the flow of the me` dium, to'the admission ports 27 of the piston cases 28. Having been carried along by the rotary istons, the medium then ilows from the piston cases 28 through the outlets 29 into wide chambers 30 separated from the chambers 25-by the helical walls 26 and enclosed between the jacket 31 and the walls 26 and therefore offering but little resistance, and from here to the opposite end of the pump case, lwhere it enters the collecting main. The medium to be led to and away from the piston cases 28 thus Hows in the suction as wellas/in the deliver space in but one direction, viz, that of t e pump axis. By providing severalr iston cases and surroun ing them with a Jacket as described, the entrance and the outlets of the separate piston cases 28 are formed by plain channels of large section involving but small and gradual deviations and little resistance to the flow of the medium. The connections for the suction or delivery pipes conveying the pumped air can also be designed and mounted in a simple manner.

Fig. 7 shows a pump with four' piston cases 28 arranged around one valve. In accordance with the arrangement of Fig. 5, the four piston cases 28 are enclosed in a pump case formed by a cylindrical jacket 31, t e helical walls 26, 32 of which divide the pump case into four wide chambers 25, 30 which lead the medium to and away from the (piston cases 28. The medium to be pum e enters the chambers 25 on one side of t e pump, asindicated by arrows in Fig. 8, these chambers guiding it throughthe admission ports 27 of the rotary pis- 'course be arranged inside the front mesme As can be seen by inspection of the devel-` oped section shown in Fig. 8 (following the line VIII-VIII in Fig. 7), the entrance andv outlet sections for the flow of the medium to be pumped are very vlarge and the resistance to the fiow is correspondingly very small. In the Fi res 7 and 8 the flow of the medium is in icated by arrows.

Fig. 9 is a side view of a pumpconstructed accordin to the arrangement vof Fig. 7. The air suc ed in from outside enters the perforated front face 35 of the pump case at the right and, having been pumped, leaves the pump case through the collecting main 36 arranged on the other front face of thepump case. The valve and the piston bodies are driven by the toothed wheel gear 37, the driving means .for the pump, which may be a belt pulley or a toothed wheel, being marked 38. The gear v37 may of late 35.

I wish `it to e understood that do not desire to be limited to the exact details of construction shown and described, for obviens modifications will occur to a person skilled in the art.

I claim:

1. In a rotary pump in combination a stationary casing, a plurality of rotary pistons adapted to rotate about a common axis within said casing, lateral discs rigidly connected to the ends of said pistons, a bearing associated with each disc for supporting it rotatably in said casing and driving means fitted to one of said discs. v

2a In a rotary pump in combination, a stationary casing, a plurality of rotary pistons adapted to rotate about a common axis within said casing, .lateral discs rigidly con-- nected to the ends of said istons, a filling body enclosed between sai rotary pistons and said lateral discs, journals extending from said filling bod through borin s of said lateral discs and xing said filling ody in osition in said casing and a bearing assoclated with each disc for supporting it rotatably `on one of said journals.

3. In ,a rotary pump in combination, a stationary casing a plurality of rotary pistons adapted to rotate about a common axis within said casin lateral discs rigidly connected to the en s of said istons, a filling body enclosed between sai rotary pistons and said lateral discs, a rotary valve ada ted to co-operate with said istons and enc osed in said casing, and axia y directed entrance land dischar e lchannels for the.

kindY described in medium to be conveye 4. In a device of the combination, a plurality of rotary pistons adapted'to rotate about a common axis, lateral disks common to said pistons and rigidly connected therewith, a rotary valve `adapted to (zo-operate with said pistons, a

casing surrounding both said valve and said pistons, a mantle surroundln said casing, two channels for each piston ollowmg each other in axial direction and exten between said casing and said mantle and elil0 cal partitions connecting the front faces of said casing and separating said channels.

In testimony whereof I aix my signature. 

